She is portrayed by Carroll Baker.
Eleanor is the mother of Cullen Crisp, the film's main antagonist, and helps him in his efforts to find his ex-wife Rachel and his son Dominic. Eleanor is very close to her son and is prepared to do anything he requires of her. She kills the only witness to a murder committed by Crisp using spiked cocaine, and she ac company's Crisp to Astoria Elementary School to help search for Dominic.
When undercover cop Detective Phoebe O'Hara attempts to pursue Crisp after he abducts Dominic during a fire alarm, Eleanor runs her over with her car. She then attempts to kill Detective John Kimble after he shoots and kills Crisp, but an injured O'Hara appears and knocks her out with a baseball bat. Eleanor is then arrested by the police for attempted murder of a police officer and accessory to murder and sent to prison for life.
Eleanor is cruel, brutal, heartless, domineering woman with a high capacity for violence.